Hanli Liu

Planetary-scale Wave Impacts on the Venusian Upper Mesosphere and Lower Thermosphere

Graphic image of VTGCM temperature profiles
Wednesday, December 30, 2020

Venus’ atmosphere has a cloud layer (~40 km - ~70 km) that encompasses the whole planet that separates the lower atmosphere and upper atmosphere.

Gravity-wave-perturbed wind shears derived from SABER temperature observations

Graphic depicting wind shear
Wednesday, December 16, 2020

Large wind shears around the mesopause region play an important role in atmospheric neutral dynamics and ionospheric electrodynamics.

Effective vertical diffusion by atmospheric gravity waves

Graphic image depicting effective diffusion coefficient
Wednesday, December 16, 2020

Han-Li Liu has observed that atmospheric gravity waves may transport heat and chemical species in the vertical direction.

Assimilation of Ionosphere Observations in the Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (WACCMX)

Graphic image of WACCMX+DART experiments
Thursday, July 16, 2020

The Earth’s upper atmosphere impacts a wide range of technologies, including satellite communication and navigation signals. Specification and forecasting of the upper atmosphere are critical for mitigating these effects.

Global Modeling of Equatorial Spread F with SAMI3/WACCM-X

Graphic image of the comparison of 135.6 nm emissions
Tuesday, June 2, 2020

We report the first results of a global ionosphere/thermosphere simulation study that self-consistently generates large-scale equatorial spread F (ESF) plasma bubbles in the post-sunset ionosphere.

Quiet-time Day-to-day Variability of Equatorial Vertical E×B Drift from Atmosphere Perturbations at Dawn

Graphic image of variability vertical ExB drift
Friday, March 20, 2020

The ionosphere is different from one day to the next, even under geomagnetic and solar quiet condition. The vertical E×B drift at the geomagnetic equator is a key parameter that influences the state of the ionosphere and atmosphere.

Quantifying Gravity Wave Forcing Using Scale Invariance

Graph depicting Gravity Wave Forcing
Thursday, June 13, 2019

Despite the increasing resolution, forcing on the mean circulation by resolved waves in general circulation models is not yet converging. Parameterization of the forcing remains a major source of model uncertainty.

The long-term trends of nocturnal mesopause temperature and altitude revealed by the Na lidar observations between 1990 and 2018 at mid-latitude

Graph showing WACCM-X (2.0) simulated summer temperature profiles of year 1974 and year 2003
Sunday, December 2, 2018

The nighttime mesopause, marking the boundary of mesosphere and thermosphere and having the coldest atmospheric temperature, is formed mainly by the combination of radiative cooling by CO2, and the adiabatic flow in the Mesosphere and Lower Thermosphere.

Hanli Liu gives CEDAR Prize Lecture

Hanli Liu-CEDAR Prize Lecture

Hanli Liu gave the CEDAR Prize Lecture on Thursday, June 28th, at the CEDAR Summer Workshop in Santa Fe, New Mexico.

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